[libc] [llvm] [libc] Make GPU `_end` kernel only call exit callbacks (PR #162371)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- libc/startup/gpu/amdgpu/start.cpp libc/startup/gpu/nvptx/start.cpp llvm/tools/llvm-gpu-loader/amdhsa.cpp llvm/tools/llvm-gpu-loader/llvm-gpu-loader.h llvm/tools/llvm-gpu-loader/nvptx.cpp
``````````

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``````````diff
diff --git a/libc/startup/gpu/nvptx/start.cpp b/libc/startup/gpu/nvptx/start.cpp
index f6e0c849b..3dd85fdf3 100644
--- a/libc/startup/gpu/nvptx/start.cpp
+++ b/libc/startup/gpu/nvptx/start.cpp
@@ -71,8 +71,7 @@ _start(int argc, char **argv, char **envp, int *ret) {
   __atomic_fetch_or(ret, main(argc, argv, envp), __ATOMIC_RELAXED);
 }
 
-extern "C" [[gnu::visibility("protected"), clang::nvptx_kernel]] void
-_end() {
+extern "C" [[gnu::visibility("protected"), clang::nvptx_kernel]] void _end() {
   // Only a single thread should call the destructors registred with 'atexit'.
   // The loader utility will handle the actual exit and return code cleanly.
   __cxa_finalize(nullptr);

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https://github.com/llvm/llvm-project/pull/162371